题目内容

花键可分为、渐开线花键、端齿花键。

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花键联接三种定心方式有、大径定心和键（槽）宽定心。

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键和键槽宽的配合采用（）配合制。

A. 基孔制
B. 基轴制
C. 基孔制或基轴制
D. 不确定

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按照配合的松紧不同，平键联接的配合分为（）。

A. 松联接
B. 正常联接
C. 紧密联接
D. 一般联接

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Why does the supplier reject the buyer's request for reduction of orders in Dialogue 3?

A. The products the buyer has ordered has been produced totally.
B. The supplier is going to arrange transportation soon.
C. The products the buyer has ordered are customerized(定制的).
D. The supplier may suffer from some losses.

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